the cooling and heating effect of central air conditioning has an important relationship with the quality of the compressor. Hitachi has done a good job in the compressor of central air-conditioning, and the technology is relatively advanced. You can learn about the background of the compressor: Hitachi is the head of the core technology of central air-conditioning, and the third-generation scroll compressor was invented in 1983, and the patented technology remained for 2 years. Daikin used Hitachi compressors from 1983 to 23, and it was not until the patent technology of Hitachi expired in 23 that Daikin began to independently produce its own compressors in Xi' an; At this time, Hitachi has invented and mastered a higher patented technology. Based on the manufacturing of the third generation scroll compressor, it innovatively developed the oil separation technology inside the compressor (which can greatly prolong the service life of the compressor), and this technology has also applied for a patent, that is to say, only Hitachi in the industry can enjoy this technology exclusively. With this patent alone, Hitachi has occupied the dominant position in the industry for the next 2 years without any objection. Now Daikin uses Hitachi's compressor technology 26 years ago. No way, Hitachi has taken the lead again, and the compressor oil return technology has also applied for a patent. Daikin will have to wait another 2 years if he wants to use it.
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